Ocfs2 devel - Jan 2010 - [PATCH 0/3] ocfs2: add freeze/thaw support -v2

changes from v1
1): fs locking prototol version up 0.1 instead of change in dlm protocol
version.
2): fixes the racing with umount. yet relies on cancelable cluster lock.
3): timeout the joinning in a cluster when it's frozen instead of waiting
until
    thaw. yet relies on cancelable cluster lock.
4): fix deadlock(with super lock) when joining in a frozen cluster. Move freeze
    lock out of super lock.
5): takes care of a node crash when cluster is frozen(recvery related). Flush
    journal in ocfs2_sync_fs() when cluster is in progress of frozen. so that
    no journal replay needed.
6): tiny changes